Adjust /nginx/default.conf template to use private DNS for OCSP check during auto creation

During the deployment of self-hosted Bitwarden the ./nginx/default.conf gets auto created (generate_nginx_config: true).

In this file there is an OCSP check but this uses external DNS servers and this is not always allowed behind a corporate firewall:


Please make it possible to edit the template that is used to auto create this file to include private DNS servers so that no errors will be logged on corporate firewalls and the check will complete successfully.